Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ad4fce7dc3fdc7b86c2224652290ed8555f35db34c245e8605033973ae6fe6' 
  AND token = 'OcW2CEiHEafJ3zLpy8Osre5ORTVkZSZepiLqcw5c8wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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