SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d67b31d986fa47341361daa6e4e2787edc9ef6e1bf69f7d0467353c18404dc' 
  AND token = 'SF35YBXYJHA/g+1G3BqTMg/6orNjazOLhqFQU0wmeNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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