Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e1509ebcbf19afd0070d2dc6029fb504255a8e82197abef70f3055b2a1c9ae' 
  AND token = 'mV/Gz1/tiNPGiqsmu2fdtQiWX34eLs284h2XzNj1jy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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