Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1486ad0bbdf2cf37e0048e977f6bc0b34f6b3d05fbf2b75900cf8fa81dfd3ce5' 
  AND token = 'AQtNhm4nHZpKkjceYschG9wf6ndZFytf0K+whNBBF44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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