SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6195bd5b6ac640ebc04026430389e7ef7f144bb2e0258f5336f14bf46c37ed95' 
  AND token = 'XPrXjEwvWqxKnhJJ0/i8+LyYC0k3BIQpZmsaaecGebM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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