SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928290d59ff864656f1ab62a6a5bb6309fd5b71acc9ba0089f60eb7f74d13949' 
  AND token = 'LjrcyjiDGU/FYQ7UnjRZFOz9Dj/Dyq1ForqsKVjgZMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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