Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1fe0cbbd1645207dfba569e2b42b2bd73cd959e6fa12768711df20b55f0ba9' 
  AND token = 'lY3IdAaV0peX4CluhX7IZMPFwyFXqPZBUm0Vd8seJE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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