Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1442b2d4564104552b047fe024714c5b17b93c8ec6f5f791858b17b5f4297081' 
  AND token = '1pZ1g0JAg4clvWQn9G3MozDwTCCtjLP+AEP5vRxAAOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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