Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0dd2fe5d0f1f3286aed48adf2e11bddc48faf14848a689533b00ec26838804' 
  AND token = 'Y1B571/FQ4L4hJLDDFHIjBWnDowYNHY6tOU3rI4pqnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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