Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce293119dfed73703a03f8e7f05ddbbd27544f1d35553cc863bad4435579ba0' 
  AND token = '+ATP35YrLR1znyB4IT9d/BamMLtj0bkbTMR1KmbED8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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