Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e6d421e127725325305fe8e3e71d4a40df317af7094c4231d3ce3c36f79f4a' 
  AND token = 'f0343RYI9LHm45Qm8u6mPZooz9loJzjBGVQ45G5NnYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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