Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce77fcec5be6b170e0cb0760213ba3128ec531b343b645c3439e0f7ebf1a2a93' 
  AND token = '+x1kiy7uLA8+Tu7TdqItt2bZqDeOcs7TTuqleQOXfiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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