Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42288511a2505f3f0c97031e3321edd8e91cb0be2ac16277db7f8c9ec7817000' 
  AND token = 'q7w8Sn5P1ovvUUh2jvf7XKP2YW5zj6yF8j5XaO7DgHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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