SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032d7b0e8df0622c9ea85f2265af742aafda1582898ac85a9094337656a32e98' 
  AND token = 'WPQFpBr+GEYbzLIRbALMgzsj8+q1we3T19XFv0bD/ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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