Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a079ae5a898da4f71d1c786c037bc234a605c2f8c4f773adc92c242bcb2426c' 
  AND token = 'ZSds3F3p3eUYBbohDgp5LV85xzAdeEpqEg9d5YbQeU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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