Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d13c32ccf2c02c75862d967d257a5b3c657304389422ea8078813deaace260' 
  AND token = 'lpKrmrrbNlm/WWzvFEnK3XQAmTpcZrDLAetsPy18/MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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