Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1aa487555850ef2c50b04c5d04ea5b5c1f76f23e3f9b5e48946ebd08a8b3585' 
  AND token = 'RAhmAv4TkJJOHp4VGzHNMbvumdpX0a9oPz2plqNUx/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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