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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e353cb6ec794a7a44c04f976a9b55fb44e39f2f5f34937be8cc1303731ae9c' 
  AND token = '/kL5ainK74WRYeueU30+TCkybh8RX9/uZ1/8/b4AvMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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