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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861442032089c934025a7273a1fd29259ef503e6776031e77152c5e1933af8b8' 
  AND token = '+uHM9vYFUmZAtRzxDdKU7Z5U2H1u5VlL7uomRJZbYlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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