Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508ad516945ab775aec1d62130c86f56bc76ce589dc9a0f988546fdbfc3d1d6b' 
  AND token = 'KC8PrqXWmoSxYyIW0vMlUvipn6Fsh6++lHcx2yyh8LA=' 
  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"
    }
  }
}