Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a435a4a813b8d9547f3b1bd25da2ac9b863ae3722d7f144f030a51a95e1357' 
  AND token = 'JUk63S49SNapyNlv20oVaV3rJ67yNmX7EBCpaUUuEVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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