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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de96bd7e606ec321f2edec65e320a39b3bec4adfcef438997e4de4cd7ba8843' 
  AND token = 'YAPnhnH5qk1x+P9eq0Wl6BygS2WxetJtT6LwEWhoT24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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