Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9de1674bad3ae6c4feecf309a9ea10d6595f889c7e99db0d22efe0ced6dd1c' 
  AND token = 'zVWTlnfCCx9hq9YLCqd/q1LLn7xURYBsfjvgIkEw7Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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