Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7f6af29853bf29859fe19090992a68da9fbeec23980a76cd0d2a40b220df35' 
  AND token = '5w1Dol71xGQzEceYVnVE6mexDHZ9SYFRq8fcInYZE94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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