Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebae61f4ed6909167252ead23b8ba7f360712c95a1b8c3f4411b43592072c38' 
  AND token = 'URQqCenpfQTdCptRFxFg7W6HYH8+TyUMcCBmr/VOumE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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