Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa1162f209333fe41de404ce685b5c882a03ef901d2b5b9e36bcbb64084bc47' 
  AND token = 'kEeo78q27PlBQfEhz1oskhmW5wxtjKK1lauv/8+Tn7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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