Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8842f480d6f6881911bfe58814f15d5ae95603094d56bdad43532c51621fa7cd' 
  AND token = 'xfmp3L8VOQS1dNoNkZb1lmceNPt2ALjBXkkJO9i/IDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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