Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21ba5035f5f0feeb0db7f246a791eaeb7c73d1cc45ef86c8a60232e32c8b968' 
  AND token = 'Me+Oz3Tme408qtcqDFy9ZbzpVM6l+jO/HvDRbcoc6ac=' 
  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"
    }
  }
}