Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778500230d8c5a1e04acf2a2b3dc5158c884d5b0c30daff18fc7df3015e9ac7e' 
  AND token = '7kWGC5F+4ViWLm98QoLoUt72XCJmbcZ4iKNl1CGAgCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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