Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bc7d2bce8106a65ca20a78dca286747321a6d3066c022ce339986e95d136e0' 
  AND token = 'SPGkLHETf8rdNpBuIKPSkJivMCW2VC7TwI/UGO2zpYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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