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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fb3d047e8758db4625d95ae3e81f356ccd05cffd069619a59ff12740c900b5' 
  AND token = 's9F/yIJIo5HKCn/UQdqN6eFogZwj1voIsI56Q1VZFlQ=' 
  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"
    }
  }
}