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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc130af9c600ea3c6993f9be8a6329d5b43b1416afd385893dff86238c8663f' 
  AND token = 'c9v/dh9OI7ftkTZM/lMX6SNmuBTXBs1MvPk7xOREeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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