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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c952720d39c799eaa8bdd87ecc8167182bb37a4d2955250e949c83b8ccfc49' 
  AND token = '0VWP+tJM8eHzY68eJ0uXn6+RGBqNITql3N25VJSvI0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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