Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c465661738e461ed46af33f09c1c6a47e396f60c615697ee9187ce7eeb8a8b' 
  AND token = 'msdTTwXinDGvknn2iSFUUrod75bIFuLSJSx1s7Ge250=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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