SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911603d357f7be21e975b77571560ff9222a751e032e376a49779b89539adbfa' 
  AND token = 'wpnPwzv9MVWBQGicbX0/I4tjJiqwqN4tpUbYL3PdZ+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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