Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f4e986c2414721a91783d9ac12d1df7b1d64c13d8f853e8d47aad42413b745' 
  AND token = 'r7qdo6dspIqGjfZUgqDXRXGRGZSKd+9G+kRHN2hy59g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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