Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08c9844c0d9e714be27b05bd2ffff7c5986ad6f3afdd0a3060e71d697e68739' 
  AND token = 'MIIFMIy9lIBYuSMM4rN72dJMtEDBu2B/VKqZmqeYE3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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