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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3917df219c3f7e2a679699e254362e0be33833ba728785729fd36e39571af4' 
  AND token = 'kUx0D+zw44N8XWQ+ck+IPFIe4n1lK2xhDOcvobZzE3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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