SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d8db5e226f17bb61efe57da35797b887edb63576c3babd0ab3866b1d9240f9' 
  AND token = 'ogJc25nTN8++FH5K3OYRzTwW5jNFskCqYPDZnv/rbzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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