Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e881c0cd2d780994e3049a2c2b2435d6b228199e5f0300ba53e6227ab26ec22' 
  AND token = 'P9Nw2vwcfzoYiwQdOsHGRNYT6PHWkTNNUoXmYNSJoC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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