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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40855c8e325e561c53e1b255a34a5ed51f6a094db6e0f016f13143aced48836' 
  AND token = 'fE5Vn8qShF4JxkWYsmvC5sWdHvY+xqLIbXTofoyPj2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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