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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69c4b56a3be7f78e2d1bbf49e6c096a218ca7bbb384f6813171faec401fe5df' 
  AND token = 'm9mt4HYu0p65rky7Go3GBl4ItodKDxY4dPWIrXmBb5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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