SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccbc327d3864c85a8a16ef432d078e2db280d5019f1a639209b0384d89f3a55' 
  AND token = 'HgjZMs51RU9YTXo2iwgw38KX5Mhzv31CBq59k1YFBUs=' 
  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"
    }
  }
}