Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a3fa8e9b9ea1fa912ccb6bd9db81e6836a1b214863cf0e17888dc4c63bab46' 
  AND token = 'U0JzVkwYezJ1Lwr99tSJFgcsfOqw8ZfkbVyvbBMDJJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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