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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6725c91e5ec454ec7a321456c0e4a339275892d875a667e0d45e03879c71f05' 
  AND token = 'FfUH/7Xu3vHlsye4EE+3xD2rhySaDWTw0roCzaCpi/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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