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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edeea5abd35bc87383805d00c9a6c23f77134b5a90bbd06ddb955db525303d94' 
  AND token = 'ArK7o31yYyJ6UgmH4T9M/ckOAnw+E6ghk36noUaUeuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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