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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999a9671e237d454ee8fdc0d71c6cc91f58d264f26ca3ebd81e0247c072e15fa' 
  AND token = '6fJ+ck1OwJpdv7fwdbhOCP6KHWCB/bNhJ9HaHS9e5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}