Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a815d912d924e52f79da116d0e5f64a6064726a7c1113ed03ab1b71f064c71' 
  AND token = 'WAPo+jTqsDggRK1TLND8EtiZwn4bdIhT07KlYraTPFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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