Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb5889e3deed75997b4f655e6b32a65092f23bda43de6a4f107e40807bae5fc' 
  AND token = '4FXf6xbF/JKurIeXxqcSPurQG8dZfPHVaB6mj3oUREw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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