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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f8e825fa357d6a84d6a3aa5f806270e3c8e84dd8cc233b01366280872eaa0c' 
  AND token = '4MX9g8dRtTe2TXlIz8NVvYBbmiq65JrhADnQiLuOgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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