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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d2f96e04a239e9935b854b73d67bc4f83284597be2db522ffbe579e2d82af4' 
  AND token = 'B7Wy7j3YcT/MOMRoHy/HbPvBW2Q60MzD5GR7BuKTqiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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