Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719fc14b104d1ad6e345debeafac847eda9cd6c00357b432d847ae5fbed67ce9' 
  AND token = 'UfNswKDEt4dWXj652yn8D+Rqkz6sEvk2kms0n25TTWw=' 
  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"
    }
  }
}