Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cb929793112ffa3779fa8058c070c46c910ddc1796ab468abba2eaa0e6b817' 
  AND token = 'noxTKj7cDzTVYCQ4ve2PWPM/l2DiUE3QdMbmOY5tzkM=' 
  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"
    }
  }
}