Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668c49288f9c2fca228530d0d99c39e411370b0cac867586510a919f505306e3' 
  AND token = '8jhABxReE1uUKRREdKKpWxti7Xz/3rFnq//WwKAlCIg=' 
  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"
    }
  }
}