Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a194ef0276255b725309dd0dafe46e2b4ad41567fc98dac735c60209cb3daf15' 
  AND token = '94YfU4b/b7KdCysVS1T7pdNB8rCRmEhv8ddK0rxlIKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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