SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d65931c68c44813707cf26a6b9e71e93d13d55744d213bf88cfcea8266d7c40' 
  AND token = 'CsGg+W/Zk7A4J8pw/9g2Uc7Eqk7KpI8G8ZbV21jXQoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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