SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657d10b40af929659ece18e5e150850a1bd63ea25dd9f868b8f13944c70d952b' 
  AND token = 'qrGOFZQGBlzWSumTwZhxV4qZO7Pha/0KSO+91fPi7GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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