Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638a702a707295bd359c636d64a3e8ac3136c5fcf45d195150bd53db0bd27e4c' 
  AND token = 'rJ53IXoNHgf90aghHZPS9IdxGDDJF3yOsEqerGhz3Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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