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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69f9d80df4e4ff90b447776921b9fb1ce0b59b6e5406424e556a42ade4653f2' 
  AND token = 'rWGSgCR4VuB63YAXDlFaw53n/QSVdtHUGiUbquRGYXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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