Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7e3adbacfbb88b2e76a307181d37b64f199b031a866ec9eed9db7e5364850c' 
  AND token = 'qs2MAY0wt8QUJkO8oEVY/vtCHSvuhBEBPTlkIERldco=' 
  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"
    }
  }
}