Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae1e7cb25ccb08827072268d698f285b8f8e1d9493c60a5d436055c966254e8' 
  AND token = 'nOAlQ0WlDFSfPBMjWfJimRVx7CItzUOw+9gbMImg7sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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