SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f648412b739868391f29770a2ddb4e67ab6eaf5213999ae7bcaf7139bae638' 
  AND token = 'XZzCvaCfjl/FznrNN4wZvW2jdUEKwKY8SIJ/lK54PJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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