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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4b5a155c83077fbd8e683dfa9a55614fb08aa77a9a56ece99a16b1da55abcc' 
  AND token = 'kkOMrKrr3zrq6e0+xYNn43C/notaSdHlSSYQGTx/QrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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